cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/if_fddi.h

/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Global definitions for the ANSI FDDI interface.
 *
 * Version:     @(#)if_fddi.h   1.0.2   Sep 29 2004
 *
 * Author:      Lawrence V. Stefani, <stefani@lkg.dec.com>
 *
 *              if_fddi.h is based on previous if_ether.h and if_tr.h work by
 *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *                      Donald Becker, <becker@super.org>
 *                      Alan Cox, <alan@lxorguk.ukuu.org.uk>
 *                      Steve Whitehouse, <gw7rrm@eeshack3.swan.ac.uk>
 *                      Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef _UAPI_LINUX_IF_FDDI_H

#define _UAPI_LINUX_IF_FDDI_H

#include <linux/types.h>

/*
 *  Define max and min legal sizes.  The frame sizes do not include
 *  4 byte FCS/CRC (frame check sequence).
 */

#define FDDI_K_ALEN		6	
/* Octets in one FDDI address */

#define FDDI_K_8022_HLEN	16	
/* Total octets in 802.2 header */

#define FDDI_K_SNAP_HLEN	21	
/* Total octets in 802.2 SNAP header */

#define FDDI_K_8022_ZLEN	16	
/* Min octets in 802.2 frame sans
                                           FCS */

#define FDDI_K_SNAP_ZLEN	21	
/* Min octets in 802.2 SNAP frame sans
                                           FCS */

#define FDDI_K_8022_DLEN	4475	
/* Max octets in 802.2 payload */

#define FDDI_K_SNAP_DLEN	4470	
/* Max octets in 802.2 SNAP payload */

#define FDDI_K_LLC_ZLEN		13	
/* Min octets in LLC frame sans FCS */

#define FDDI_K_LLC_LEN		4491	
/* Max octets in LLC frame sans FCS */

#define FDDI_K_OUI_LEN		3	
/* Octets in OUI in 802.2 SNAP
                                           header */

/* Define FDDI Frame Control (FC) Byte values */

#define FDDI_FC_K_VOID			0x00

#define FDDI_FC_K_NON_RESTRICTED_TOKEN	0x80

#define FDDI_FC_K_RESTRICTED_TOKEN	0xC0

#define FDDI_FC_K_SMT_MIN		0x41

#define FDDI_FC_K_SMT_MAX		0x4F

#define FDDI_FC_K_MAC_MIN		0xC1

#define FDDI_FC_K_MAC_MAX		0xCF

#define FDDI_FC_K_ASYNC_LLC_MIN		0x50

#define FDDI_FC_K_ASYNC_LLC_DEF		0x54

#define FDDI_FC_K_ASYNC_LLC_MAX		0x5F

#define FDDI_FC_K_SYNC_LLC_MIN		0xD0

#define FDDI_FC_K_SYNC_LLC_MAX		0xD7

#define FDDI_FC_K_IMPLEMENTOR_MIN	0x60

#define FDDI_FC_K_IMPLEMENTOR_MAX	0x6F

#define FDDI_FC_K_RESERVED_MIN		0x70

#define FDDI_FC_K_RESERVED_MAX		0x7F

/* Define LLC and SNAP constants */

#define FDDI_EXTENDED_SAP		0xAA

#define FDDI_UI_CMD			0x03

/* Define 802.2 Type 1 header */

struct fddi_8022_1_hdr {
	
__u8	dsap;			/* destination service access point */
	
__u8	ssap;			/* source service access point */
	
__u8	ctrl;			/* control byte #1 */
} __attribute__((packed));

/* Define 802.2 Type 2 header */

struct fddi_8022_2_hdr {
	
__u8	dsap;			/* destination service access point */
	
__u8	ssap;			/* source service access point */
	
__u8	ctrl_1;			/* control byte #1 */
	
__u8	ctrl_2;			/* control byte #2 */
} __attribute__((packed));

/* Define 802.2 SNAP header */

struct fddi_snap_hdr {
	
__u8	dsap;			/* always 0xAA */
	
__u8	ssap;			/* always 0xAA */
	
__u8	ctrl;			/* always 0x03 */
	
__u8	oui[FDDI_K_OUI_LEN];	/* organizational universal id */
	
__be16	ethertype;		/* packet type ID field */
} __attribute__((packed));

/* Define FDDI LLC frame header */

struct fddihdr {
	
__u8	fc;			/* frame control */
	
__u8	daddr[FDDI_K_ALEN];	/* destination address */
	
__u8	saddr[FDDI_K_ALEN];	/* source address */
	union {
		
struct fddi_8022_1_hdr	llc_8022_1;
		
struct fddi_8022_2_hdr	llc_8022_2;
		
struct fddi_snap_hdr	llc_snap;
	
} hdr;
} __attribute__((packed));


#endif /* _UAPI_LINUX_IF_FDDI_H */

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